Heat transfer device



April 2, 1935. F M, YOUNG 1,996,498

HEAT TRANSFER DEVICE Filed June 18, 1934 ,4770i EV Patented Apr. 2, 1935.

HEAT TRANSFER DEVICE Fred M. Young, Racine, Wis., assignor to Young Radiator Company, Racine, Wis.

Application June 1 8, 1934, Serial No. 731,051

9 Claims.

My invention relates to novel means for strengthening the tube ends, in and adjacent their connection to the tube plates of radiators and the like;v it further refers to a novel manner of making dead ends on certain tubes.

My improvement is especially adapted for radiators and the like wherein the tubes are flattened or` oval, the at sides positioned longitudinal to the direction of air flow, and the tube plates have openings into which the tube ends are brazed or otherwise bonded.

Because of unequal expansion and contraction and a slight bulging of the tube plate caused by varying pressurein the system, a considerable bending strain is placed on the-tube edges at or adjacent the point where they enter the header plates, resulting in frequent fractures. The matter is serious because repairs are usually dilcult or impossible. I provide novel means whereby the tube ends are greatly strengthened at their ends in a manner which will hereinafter appear.

To these and other useful ends, my invention resides in features of construction, the parts and combinations thereof, and mode of operation, or their equivalents, as is hereinafter set forth and claimed and shown in the accompanying drawing in which:

Figure 1 is a side lelevation of `a radiator equipped with my invention, a fraction being shown in section.

Figure 2 is a fractional front elevation of the structure shown in Figure l.

Figure 3 is an enlarged fractional section of a tube and plate as shown at the bottom of Figure l, showing my improved device in position in the tube.

Figure 4 is a transverse section taken on line 4 of Figure 3.

Figure 5 is a section taken on lline 5 of Figure 3.

Figure 6 is a similar view to Figure 5, wherein an oval shaped tube is shown.

Figure 7 is a sectional view taken on line 1 of Figure 8.

Figure 8 is a sectional view taken on line 8 of Figure 7.

Figure 9 is an enlarged side elevation of one form of my invention.

As thus illustrated in the various gures, I 2 designates the tubes of a conventional radiator. These tubes are shown as having preferably fiat sides and narrow curved edges, as clearly indicated in Figure 5. The tubes are positioned in transverse rows between the header or tube plates I3, the narrow sides longitudinal to the direction of air flow. The tubes preferably extend `through closely spaced ns l 4. Suitable header caps`|`5 are provided. Thus a cooling or heating liquid or gas may pass from one header to the other in the usual manner. l

Tubes of this class "are very thin and fragile. There is unequal expansion and contraction and the tube plates bulge slightly transversely when the device is subjected to pressure, causing the tubes to bend and break at the point where they 10 enter the opening in the plate. This condition prevails particularly invattened or oval tubes, because they do not readily bend edgewise.

, I provide means for strengthening the tube end to thereby prevent fractures in the following 15 manner: i

I providesstaples which are designated in their entirety, by reference character A,V see Figure 9. 'Ihis staple 4is made from suitable material preferably from round stock and formed as shown in 20 Figure 9,.having the 'closed end portion 20, and side members 2I-2l, having connecting curves as at 22-22. Members 2l are m'ade to normally diverge outwardly, as clearly indicated in Figure 9. Short inwardly extending ends 23 are, pref- 25 erably, provided in order to facilitate placing the staple in the tube end. The long curves as at 22 provide sufficient resiliency to insure against the free ends of .members 2| being forced from the wall, as might be the casel if these curves were 30 very sharp.

Thus it will be seen by scrutinizingFigures 1 and 3, that the edges of the tubes 'where they enter the tube plate, and.v for a short distance therefrom, are greatly strengthened. It being understood that'the staples may be tinned be'44 fore being inserted, thus when the plate and tube ends are dipped, into the bonding material or otherwise bonded, the staples will be suitably bonded, to the tube for the length of members 2 I. 40

My improvement is adapted to be applied to oval shaped tubes as illustrated in Figure 6. The staples obviously may be made from half round stock or any form of material suitable to iit into the tube edges or suitably contact the inner wall 46 of any shaped tube.

In devices of the class it is frequently necessary to make a tube dead by closing its end. In Figures 7 and 8, I illustrate a means to this end. The staple is simply pressed into the tubefar 50 enough so its end member 20 fills the tube, thus after bonding, the tube will be sealed shut, whereas as illustrated in Figures 1, 3 and 4, the member 20 is left a short distance away from the tube end, thus to provide plenty of area as at 25, for I5 the liquid in its passage under member 20 and into or out of the tube ends.

Having thus shown and described my invention I claim:

l. In a device of the class, having a number of tubes and suitable headers therefor, said tubes having a flattened shape in cross section, the narrow edges formed in. a circle, staples having a shape which fits snugly into said edges the free ends extending a distance into said tubes, and the closed end protruding therefrom a short distance, said tubes and staples being intimately bonded together.

2. In a device of the class, having a number of tubes and suitable headers therefor, said tubes having an oval shape in cross section, the narrow edges being rounded, staples having a shape which fits snugly into said edges, the free ends extending a distance into said tubes, and the closed ends protruding therefrom a short distance, said tubes and staples being intimately bonded together.

3. In a device of the class, comprising a number of tubes having fiat sides and narrow curved edges, suitable headers for said tubes, staples having a shape to thereby t snugly into said edges of certain tubes, the free ends extending a distance into said certain tubes, and the closed end of said staples positioned within said tube ends, said staples being bonded into said tubes to thereby form closed ends therefor.

4. In a device of the class, comprising a tube having a attened shape in cross section and a header plate therefor, thetube end protruding slightly therethrough, a staple, the sides of which t closely into the vnarrow edges of said tube for a distance past said header plate, the closed end of said staple protruding from said tube a short distance, said tube, plate, and staple being intimately bonded together.

45. In a device of the class, comprising a tube having an oval shape in cross section and a header plate therefor, the tube end protruding therethrough, a staple, the sides of which fit snugly into the narrow edges of said tube for a suitable distance past said plate, the closed end protruding therefrom for a short distance, said tubes, plates, and staple being intimately bonded together.

6. In a device of the class, comprising a tube having a flattened shape in cross section and a header plate therefor, a staple, the side members of which normally diverge outwardly slightly and having short ends which converge inwardly, said free ends inserted in said tube and extending a distance therein the other end member protruding a short distance therefrom.

7. In a device of the class, comprising a tube having a flattened'shape in cross section, forming two narrow curved edges, a staple, the side members of which normally diverge outwardly and are suitably spaced apart to thereby parallel and yieldingly engage said curved edges when pressed into said tube ends, the closed end protruding a short distance, said side members and curved edges being intimately bonded together.

8. In a device of the class comprising a tube having an elongated cross section and a tube plate therefore, a wire staple of a section and width whereby the free ends iit snugly into the narrow edges-and extending a distance therein, the closed end prortuding a short distance therefrom.

9. A device of the class comprising, a tube elongated in cross section, a tube plate having a suitable opening into which the end of said tube is bonded, a staple, the side members of which are adapted to be yieldingly inserted into the narrow sides of said tube and to be partially embraced thereby, said side members extending into said tube adjacent and a distance past Said plate and being intimately bonded to said tube.

FRED M. YOUNG. 

